stuff that repels
As in the case of unlike magnetic poles, unlike electric charges ____.
a.attract each other
b.repel each other
c.exist in pairs
d.do not interact
a attract each other
In a parallel circuit with three bulbs, ____.
a. the bulbs must all be located on the same branch
b. there is only one path for the current to take
c. current from each bulb has its own path
d. the overall resistance increases if a new branch is added
current from each bulb has its own path
A device used to open and close an electric circuit is a (an) ____.
a. light bulb
b. energy source
c. switch
d. resistor
switch
A temporary magnet ____.
a.keeps its magnetism for a long time
b.cannot be destroyed
c.easily loses its magnetism
d.has two north poles
easily loses its magnetism
An alternating current consists of charges that ____.
a.turn on and off repeatedly
b.move back and forth in a circuit
c.flow in one direction only
d.flow in one direction in some devices and change direction in others
move back and forth in a circuit
The buildup of charges on an object is called ____.
a.static discharge
b.static electricity
c.positive charge
d.negative charge
static electricity
The charge on a proton is ____.
a.negative, and the charge on an electron is positive
b.positive, and the charge on an electron is negative
c.the same as the charge on an electron
d.can change according to the situation
positive, and the charge on an electron is negative
Magnetic poles that are alike ____.
a. attract each other
b. repel each other
c. do not interact
d. have the same shape
repel each other
The closer together a magnet’s magnetic field lines are, ____.
a.the weaker the magnetic field
b.the stronger the magnetic field
c.the closer they are to the magnet’s center
d.the closer they are to disappearing
the stronger the magnetic field
An electric current produces a (an) ____.
a. magnetic field
b. magnet
c. solenoid
d. insulator
magnetic field
What causes charges to move in a circuit?
a.voltage
b.energy
c.electricity
d.magnetism
voltage
A complete, unbroken path through which electric charges can flow is a (an) ____.
a. electric circuit
b. electrical resistance
c. magnetic field line
d. magnetic pole
electric circuit
The region around a magnet where the magnetic force is exerted is known as its ____.
a. magnetic pole
b. lodestone
c. magnetic field
d. magnetic domain
magnetic field
Which type of energy is associated with electric currents?
a. mechanical energy
b. electrical energy
c. magnetic energy
d. geothermal energy
electrical energy
Which circuit—A or B—represents a series circuit
series 1 path
An electric current will always follow ____.
a.the path of least resistance
b a path toward the north pole
c.a path toward the south pole
d.the path that leads through insulators
the path of least resistance
Materials that allow the charges of an electric current to move freely through them are called ____.
a.insulators
b.conductors
c.resistors
d.magnets
conductors
One part of a freely swinging magnet always points ____.
a. east
b. to Earth’s geographic north pole
c. toward Earth’s core
d. to Earth’s magnetic pole in the Northern Hemisphere
to Earth’s magnetic pole in the Northern Hemisphere
The type of current produced by a battery is ____.
a. direct current
b. alternating current
c. magnetic current
d. induced current
direct current
Which circuit—A or B—is a parallel circuit
b more than 1 path
In a series circuit with three bulbs, adding another bulb will ____.
a. make the nearest bulb brighter
b. make some of the bulbs dimmer
c. make all the bulbs brighter
d. make all the bulbs dimmer
make all the bulbs dimmer
An example of an insulator is ____.
a. rubber
b. copper
c. silver
d. iron
rubber
Magnetic poles that are unlike ____.
a.attract each other
b.repel each other
c.do not interact
d.point in the same direction
a.attract each other
A device that increases or decreases voltage is called a (an) ____.
a.alternator
b.transformer
c.generator
d.turbine
transformer
Which circuit diagram represents circuit B
diagram e